The Siemens 5SU9356-1KK06 is a SENTRON RCBO — an RCD-operated circuit breaker that combines overcurrent protection and residual current detection in a single 2-module-wide (36 mm) package. It's a 1P+N design, meaning it switches the line conductor and monitors the neutral, with overcurrent protection on the line pole only. The C tripping characteristic (magnetic release at 5–10× In) handles motor-starting inrush and moderate inductive loads without nuisance trips. Rated 6 A at 30 °C ambient, the part thermally derates to 5.64 A at 40 °C, 5.46 A at 45 °C, 5.22 A at 50 °C, and 4.86 A at 55 °C — a curve that matters when the breaker is packed into a warm enclosure alongside other heat sources.
Panel integration and mechanical fit
Environmental and electrical endurance
Halogen-free and silicon-free construction. The insulation voltage (Ui) is 264 V, surge voltage resistance is 4 000 V, and surge current resistance at 8/20 μS is 1 kA.